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Debugging Java

The easiest way to debug Java code is to add some logging statements
to the code.

Debugging XSLT scripts

Much of GeoNetwork's functionality is implemented through XSLT scripts
that are applied to the XML output of some Java code.
It is possible to see that XML output and run an XSLT script
on it independently.
The best way to do this is to enable Jeeves debugging.
In web/geonetwork/WEB-INF/config.xml, in the <general>
section, set <debug>true</debug> and restart GeoNetwork. Then
you can add an exclamation mark (!) to the end of the
name of a service to view the intermediate XML.
For example, if you bring up the GeoNetwork home page in your
browser, the URL will end in ...main.home. Edit the
URL to ...main.home! and press Enter. The intermediate
XML for this page will (eventually) be displayed. You
can save this to a file and then use the command-line
version of Saxon on it. (For main.home, the script
to use is main-page.xsl, as specified in the
config.xml file.)

Debugging JavaScript and HTML in the browser

Changes/additions to layout and interactivity
have to be tested in browsers.
The means of testing and debugging in a
browser varies from browser to browser.

Internet Explorer

Microsoft Script Editor, which comes with Office, provides a full JavaScript debugger like the one in Firebug.
This tool takes up a lot of screen real estate; it's much easier to use if you have a second display.